Chapter 15.4, Problem 11SAQ

Summary Introduction

To describe:

The reasons for single trait might not show $3:1$ ratio of phenotype in the ${\text{F}}_{\text{2}}$ generation of a cross between true-breeding strains, and also to describe the reason for a pair of traits might not show $9:3:3:1$ ratio of phenotype in the ${\text{F}}_{\text{2}}$ generation of a cross between true-breeding strains.

Concept introduction:

The genotype of an organism is defined as the genetic code present in its cells. This genetic constitution of an individual influences many of its traits and characteristics. A genotypic ratio refers to the distribution of the different allelic combinations regardless of the fact, if they are expressing the same trait phenotypically or not.